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Full text of "The manufacture and properties of iron and steel"

332
METALLURGY OF IRON AND STEEL.
that there is no radical difference in the character of the metal furnished by the three makers, or between the two methods of manufacture. This does not disprove the statement that Bessemer metal is less reliable under continued shock, but it does allow the averaging of all the records, in order to increase the number of members in each group.
The result of such combination will be found in Table XVI-R, wherein all pieces of the same length and section are added together. The number of bars does not agree in each case with the number in the previous list. Thus Table XVI-Q shows 83 bars that
TABLE XVI-E. Properties of Eye-Bars, According to Length, Width and Thickness.
Kind of bar.	Number of group.	Number of heats in group.	Limits of length of ' pieces in group ; feet.	Average length of group ; feet.	Average ultimate strength; pounds per square inch.	S3 A ||. ! S&3 1*8 811 >s <	Elongation in full length; percent	Elongation in the 12 in including the fracture; percent.	Reduction ol area; per cent.
Narrow and thin; 64000 to f 4000 pounds per square inch.	1 2 3 4 6	65 182 118 82 71	38 to 16 17 to 20 21 to 25 26 to 80 31 to 85	14.8 18.6 22.7 28.1 83.2	.60070 59950 60280 60140 60120	35890 36160 36940 86530 35990	18.56 16.17 15.56 15.26 18.81	84.55 83.93 84.38 84.25 33.81	48,97 49.40 48.81 49.95 50.11
	True av. A	468	all lengths		60110	36100	. . .	84.17	49.40
Wide and thin; 64000 to 64000 pounds per square inch.	6 7 8 9	15 21 22 14	18 to 18 17 to 20 21 to 25 26 to 80	14.8 Hl.0 22.8 28.1	69380 69050 60360 58390	35730 34070 85540 83930	1758 17.18 15.92 14.94	87.58 86.79 86.00 89.61	46.75 45.13 45.81 47.89
	True av. B	72	all lengths		59540	34840	. . .	87.26	46.21
Narrow and thick; 54000 to 64000 pounds per square inch.	10 11 12	88 88 17	17 to 20 21 to 25 .   26 to 30	17.9 22.8 28.0	60050 61080 67730	35770 86040 32380	17.36 15.87 15.38	85.94 84.46 36.83	48.17 46.79 49.28
	True av. C	93	all lengths		60050	35260		85.50	4780
"Wide and thick; 54000 to 64000 pounds per square inch.	18 14 15 16 17 18	18 22 24 67 82 11	10 to IS 18 to 16 17 to 20 21 to 25 26 toPO 81 to <#	12.0 14.8 18.9 23.2 27.8 33.1	59703 59400 58930 59990 59360 68480	35130 33990 33080 84270 34330 82090	19.80 16.90 17.09 15.98 15.84 16.50	85.90 88.02 88.26 87.42 89.98 40.61	46.10 47.97 45.92 46.94 48.05 48.15
	True av. D	174	all lengths		69540	34030	. .,.	88.13	47.12
Narrow and thin; 64000 to 74000 pounds per square inch.	]9 20 21 22 23	25 58 64 38 34	18 to 16 17 to 20 2i to 26 26 to 80 81 to 85	14.7 18.5 22.9 28.T 88.1	66590 66620 66230 66150 66560	40839 40420 40730 40590 40620	16.06 15.32 14.91 14.09 14.50	81.68 81.67 82.88 82.87 80.78	47.12 46.10 46.84 46.86 47.55
	True av. E	214	all lengths		66420	40620	. . .'31.82		46.74